Natural Bridge Caverns

Natural Bridge Caverns
Location	Comal County, Texas, U.S.
Nearest city	San Antonio
Established	July 3, 1964
U.S. National Natural Landmark
Designated	1971

Natural Bridge Caverns

The Natural Bridge Caverns are the largest known commercial caverns in the state of Texas.The name was derived from the 60 ft natural limestone slab bridge that spans the amphitheater setting of the cavern's entrance. The span was left suspended when a sinkhole collapsed below it.

The caverns are located near the city of San Antonio, Texas in the Texas Hill Country next to the Natural Bridge Wildlife Ranch, a drive-through wildlife safari park. The caverns feature several unique speleothems and other geological formations. The temperature inside the cave is 21 degrees Celsius (70°F) year-round and the humidity rate is a constant 99 percent. The deepest part of the public tour is 180 feet below the surface, although undeveloped areas of the cavern reach depths of 230 feet.

The caverns are still very active and considered living. Due to the porosity of the limestone, rainwater travels downwards through the layers of rock, where it dissolves out calcite, a weak mineral that makes up all of the speleothems at Natural Bridge Caverns. After exiting the limestone, water enters the caverns where it flows and drips constantly throughout, causing the formations to retain a waxy luster that can be seen in few caverns.

History

The caverns were discovered on March 27, 1960, by students Orion Knox Jr., Preston Knodell, Al Brandt and Joe Cantu from St. Mary's University in nearby San Antonio. On their fourth trip into the caverns, the men discovered/explored just over a mile of passage. Subsequent explorations revealed 2 miles associated with what became known as the "North Cavern."

After discovery, Orion Knox Jr. assisted the landowners in obtaining information and suggestions for development. Mrs. Clara Wuest (the landowner), wanted to show the world the cave under her property. Orion approached both the National Park Service and the Texas Park System. While both entities agreed that the cavern was substantial and merited development, both groups told the landowners that funds did not exist for their respective groups to undergo such an endeavor.

Mrs. Wuest then decided that she would fund development. Orion dropped out of school to assist. He also approached Jack Burch who had just finished work on developing the Caverns of Sonora near Sonora, Texas. Jack agreed to help and development began early in 1963. Mrs. Wuest remarried Harry Heidemann, a retired Texas Highway Patrolman in the early 1960s. Together, they started work on developing the cavern. The full-time development crew included Mrs. Wuest-Heidemann, Mr. Heidemann, Jack Burch, Orion Knox, and Reggie Wuest (Mrs. Wuest-Heidemann's son). Development on the cavern began in 1963 and work on lights and trails continued until opening day, July 3, 1964. The cavern has been opened ever since and is still owned and operated by family members.Natural Bridge Caverns became a registered United States National Natural Landmark in 1971.

During excavation of the entrance trail, a human tooth, arrowheads, and spearheads dating from 5,000 BC were found. Also, just inside the entrance, a jawbone and femur of a species of black bear that became extinct over 8,000 years ago were discovered. This leads many to believe that uppermost areas of the cavern were used as a shelter by early peoples and animals at some point. An archaeological dig was recently done under the natural bridge. Archaeologists recovered arrow heads and other tools which further indicate the presence of early peoples at some point in history.

Additional Exploration

In 1967, speculation on a southern extent to the North Cavern was confirmed when test drilling indicated the presence of a large void approximately 90 feet beneath the surface. A camera was sent down the narrow shaft and photographs revealed a large chamber filled with formations. This original shaft was reamed out to 22 inches and three men were lowered into the ground. They discovered a large breakdown chamber and numerous formations. The first three men to enter this room were Jack Burch, Reggie Wuest, and Myles Kuykendall. By combining the first two letters of each man's first name, they arrived at JAREMY, and thus this newly discovered room was called the Jaremy Room.

Further investigation near the bottom of the Jaremy Room revealed a strong likelihood that another passage existed beyond a pile of rocks and boulders. In 1968 the drillers were once again brought out to the property and another exploratory shaft was sunk into the ground. This shaft also penetrated a large void approximately 150 feet below ground. As before, the initial shaft was enlarged and people dropped down into the unknown. Explorations revealed another half-mile of cavern extending to the south. This then became known as the South Cavern.

Recent Exploration

Exploration continues to date. During the summer of 2005, several hundred feet were added to the current surveyed length of the cave. It is believed that as much as another mile could be added to the survey by just mapping the known passages which have not yet been surveyed. Additional unexplored leads exist in sections of the Discovery Passages (North Cavern).

Passages Renamed

In 2008, the Caverns' owners changed the names for the passages. The "North Cavern" was changed to "Discovery Passages," and the "South Cavern" was changed to "Hidden Passages." According to the land owners, the change in names better reflects the discovery and exploration history of the Cavern and removes some confusion for guests.

Development for new tours continues.

Wildlife

There is recent evidence of bats residing in Natural Bridge Caverns including roosting areas and accumulation of bat guano. Bracken Cave, near Natural Bridge Caverns is home to one of two large bat colonies in Texas. The bats that inhabit Bracken Cave are a small species called Mexican free-tailed bats. Bats control the insect population, help to pollinate plants, and are a food source for other animals, making them a valuable part of the ecosystem. The cave was the focus of a 2013 episode of the syndicated anthology television series, Texas Country Reporter, hosted by Bob Phillips.

White Nose Syndrome

Recently it has come to the attention of conservationists that there is a disease called White Nose Syndrome affecting bats in North America. Little is known about the disease however it is having devastating affects on at least 6 species of bats. Natural Bridge Caverns has partnered with an organization known as Bat Conservation International in an effort to combat this disease. Together they raise money for much needed research and also attempt to raise awareness about WNS.

Gallery

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  The natural bridge outside the cave entrance.
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  Flowstone is a dominant feature of the caverns.
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  The cave contains large, switchbacked descents and ascents.
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  The only living plant in the cave—a small fern. The spores were believed to have been tracked in on a workers clothing, then germinated next to a light.
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  Flowstone ceiling over a switchback.
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  Tall, thin stalagmites and columns.
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  More tall, thin stalagmites.
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  A large column.
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  Closeup of flowstone.
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  A large room full of speleothems
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  The King's Throne - a large stalagmite.
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  Water on calcite shimmers in the cave's lighting.
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  "Grendel's Canyon"
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  The ascent out of the cavern contains more massive rooms.
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  The view back into the cavern from near the exit.
• Formations
  Formations
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  Pluto's Anteroom
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  Cave Entrance
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  Cave Entrance
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  The Chandelier - In the Castle of the White Giants
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  Pluto's Anteroom
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  Valley of the Fallen Lords
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  The Watchtower
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  Grendel's Canyon
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  Mount of the Landlord - In the Castle of the White Giants

External links

• Natural Bridge Caverns official website
• Natural Bridge Caverns from the Handbook of Texas Online